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Evolution from Loran-C to eLoran

Evolution from Loran-C to eLoran. By Dr Sally Basker, Mr George Shaw, Dr Paul Williams & Prof David Last. 15 February 2010. Prepared for the European eLoran Forum. Contents. Introduction Definitions Comparison Costs. Definitions. 1960s. 1970s. 1980s. 1990s. 2000s. 2010s. eLoran`.

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Evolution from Loran-C to eLoran

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  1. Evolution from Loran-C to eLoran By Dr Sally Basker, Mr George Shaw, Dr Paul Williams & Prof David Last 15 February 2010 Prepared for the European eLoran Forum

  2. Contents Introduction Definitions Comparison Costs

  3. Definitions

  4. 1960s 1970s 1980s 1990s 2000s 2010s eLoran` USCGLoran-C ModernisedLoran-C PrototypeeLoran Evolution Timeline Continuous development All dates are indicative

  5. USCG Loran-C The original version of Loran-C (c. 1960s) based on tube transmitters, SAM control, ASF look-up tables and hyperbolic navigation, requiring large numbers of people on site. Typical accuracy: 460m (95%). Modernised Loran-C The original version of NELS (c. 1990s) based on solid-state transmitters, time-of-emission timing, ASF model, hyperbolic or rho-rho navigation, and requiring very few people on site. Typical accuracy: 100m (95%). Prototype eLoran The GLAs’ system (c. 2008) based on modernised Loran-C together with(i) Eurofix to carry UTC and differential Loran, (ii) all-in-view navigation,(iii) precise ASF surveys, and (iii) differential Loran reference stations for maritime use. Typical accuracy: 10-20m (95%). Real-time prototype eLoran has been in operation for two years and is now running continuously. eLoran This is the future (c. 2013?) based on prototype eLoran together with(i) updated station equipment to improve timing stability, (ii) mitigation of vulnerabilities to ensure high availability, (iii) Eurofix at all stations, and(iv) modernised control at Brest. Typical accuracy: 10-20m (95%). Definitions

  6. Comparison Capability Performance Functionality

  7. Capability: Application Supported 1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

  8. Performance

  9. Capability: Application Supported 1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

  10. Functionality: Core System 1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

  11. Functionality: Augmentations

  12. Functionality: User Equipment 1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

  13. Costs: Modernised Loran-C to Prototype eLoran

  14. Costs: Prototype eLoran to eLoran

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